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Delaware County, PA
Population by Decades

Date Population Population
Change		 Annual
% Change
1900 94,762--
1910 117,90623,1442.2
1920 173,08455,1783.9
1930 280,264107,1804.9
1940 310,75630,4921.0
1950 414,234103,4782.9
1960 553,154138,9202.9
1970 600,03546,8810.8
1980 555,007-45,028-0.8
1990 547,651-7,356-0.1
2000 550,8643,2130.1
Source: U.S. Bureau of Census

 
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